Your view of EGW's writings disagrees with her own view of her writings:
The statement which you quote from "Testimony," No. 31, that "in these letters which I wrote, in the Testimonies I bear, I am presenting to you that which the Lord has presented to me. I do not write one article in the paper, expressing merely my own ideas. They are what God has opened before me in vision -- the precious rays of light shining from the throne," is correct. It is true concerning the articles in our papers and in the many volumes of my books. I have been instructed in accordance with the Word in the precepts of the law of God. I have been instructed in selecting from the lessons of Christ. Are not the positions taken in my writings in harmony with the teachings of Jesus Christ? If not, point it out to me. {RH, September 6, 1906 par. 1}